I have two HR20s, each recording local MPEG4s on both of its tuners (4 shows recording at once). Receiver number one gave me a searching for signal 771 error on its second tuner. I performed a red button reset and receiver one seems fine. About 40 minutes later receiver number 2 gave me the same error, I performed a red button reset and it seems to be working fine now. I just don't understand how the two receivers could have the same error 40 minutes apart. Any ideas? Signals strengths have been in 90's since my install.